A New Genus and Species of Anthicidae From Western United States
International Journal of
The first specimen of the inter 0
another dead 0
broken up 0
a living 0
a dead specimen of Tanarthrus salinus L 0
this insect is quite 0
narthrus brevipennis Csy. 0
normal 0
they have heavy spines 0
.on the internal sac 0
has a peculiar structur 0
e associated with the gonopore 0
0 BY FLOYD G. WERNER University of Arizona , Tucson , USA
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best to designate this as a new genus and place it near
Tanarthrus, but with some doubt as t.o its affinities.
Leptanthicus gen. nov.
Slender and flattened, with short elytra that leave the
main part of the abdomen exposed. Metathoracic wings
present but folded under the elytra in repose. Antennae
n.ormal and with the last segment not divided int.o two
apparent segments by a groove. Mouth parts apparently
normal, with the last segment of the maxillary palpi not
expanded or otherwise modified. Pron.otum rather slender,
without any .obvious modifications. Mesosternum not
expanded laterally, the margins straight and ending near
the outer edges of the mesocoxae. Legs not modified in
the male, with two spurs .on all the tibiae. Male genitalia
without separate parameres, slender and pointed as in
Tanarthrus. Internal sac without spines but with a com
plex and unique structure around the gonopore. Type .of
genus Leptanthicus staphylin.ifo.rmis sp. nov.
Leptanthicus staphyliniformis sp. nov
Holotype 3: almost uniformly brown in color, with
darker abdomen and paler elytra, antennae, palpi, tibiae
and tarsi. Surface generally finely punctured, with short
and fine but moderately dense pubescence, not conspicuous
ex.cept under some magnification and with longer, erect
ta.ctile setae scattered over the dorsal surface .of the body.
Length, to tip of elytra 1.97 mm., to tip .of abd.omen ca.
2.68 mm. Width: head 0.46 mm., pronotum 0.41 mm., and
elytra ca. 0.56 mm.
Head narrowly quadrate, flattened, the disc almost
flat, 0.51 mm. long to base of clypeus and 0.46 mm. wide.
Surface subopaque because of moderately dense but fine
micr.oreticulation; pubescence short, about 0.02 mm. long,
mostly subdecumbent and slightly .curved, fine and directed
toward the midline on the disc. Eyes. small, 0.17 ( 0.13
mm., pla.ced well .onto the sides and protruding only
slightly from the sides of the head; with short, erect pubescence.
Fronto-clypeal suture distinct though short. Bases of an
tennae separated by 0.18 mm. Clypeus fairly broad, 0.23
Werner-- Anthicidae
ram. wide, 0.08 mm. long, with a pair of obscure teeth
on its anterior margin and a pair of slight angulations
near the sides.; setae longer, ca. 0.08 mm., slightly curved
and projecting f.orward. Labrum largely .concealed by the
clypeus from above, evenly rounded. Mandibles projecting
beyond labrum, pointed and bifid at the tip, the upper
tooth the longer. Maxillary palpi fairly large, the last
segmerit 0.13 ( 0.08 mm., obliquely truncate. Labial palpi
very small. Antennae submonilif.orm, 1.06 mm. long, with
numerous erect setae. Measurements (in 0.01 mm., base
to apex) 15/8, 10/6, 9/5, 8/5, 8/5, 8/5, 8/5, 8/5, 9/6, 8/6,
14/6. The second segment is relatively large, the last
bluntly pointed.
Pronotum 0.51 mm. long, 0.33 wide at base, 0.20 at
collar and 0.44 at the widest point about 1/5 from the
apex. Sides almost straight to the widest point, then
rounding to collar. Disc flattened, with pubescence similar
to that of head but surface more deeply microreticulate.
Scutellum fairly small, rounded. Elytra subparallel, 0.95
mm. long, 0.46 mm. wide at humeri, ca. 0.56 at widest.
Apices obliquely truncate, in.dividually rounded at the
suture. Surface smoother than head; pubescence
moderately dense, suberect, slightly curved, fine. Three full
segments of the abdomen are left exposed, plus the pygidium.
These are well sclerotized and separate from each other.
They have pubescence similar to that on the elytra but
sparser. The first two. exposed tergites are subquadrate
and delimited on the sides by the exposed edges .of the
sternites; both have a pair of dense patches of decumben,
medially directed pale pubescence near the middle, he
patches on the anterior segment much the larger. Third
exposed segment reaching sides of body, with only a very
narrow edge .of the sternite visible, larger han the first
tw.o, somewhat arched and rounded behind. Pygidium
barely visible, the edge rounded and slightly beaded.
Surface and pubescence below similar to hat on dorsum
of abdomen. Prosternum a flattened, hexagonal plate, with
a point extended ba.ck between the procoxae. Mesosternum
not expanded, forming a straight line with the medial
edge .of the mesepisternum, the lateral edge of which
extends dorsally into a narrow lobe anterior o he base of
the elytra, this lobe following the body contour and not
provided wih long setae on its free edge. Metasternum
flattened but quite normal. Fifth visible abdominal sternite
runcate apically, the edge very gently excavated. Legs
apparently normal, moderately slender, paler (...truncated)